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Since "route frequencies" seems to be an idea that wasn't internationally agreed to until spring 1938 in Cairo and implemented as of Jan 1 1939, are the frequencies Bob provided documented anywhere as being applicable to Pan Am in 1937?

As to the dismissal of Pan Am M-130 voice Tx possibilities, here's a link that suggests they may have had that capability for local communication at leasthttp://fsim.net/b314clipper/team.htm(second paragraph)

Since "route frequencies" seems to be an idea that wasn't internationally agreed to until spring 1938 in Cairo and implemented as of Jan 1 1939, are the frequencies Bob provided documented anywhere as being applicable to Pan Am in 1937?

Bob Brandenburg replies:

The source is the November 1937 Berne List of Aeronautical and Aircraft Stations. The frequencies I provided were specific to the trans-Pacific route. Frequencies used by Pan Am aircraft flying routes (chains) in the continental U.S. are listed separately in that document.

As to the dismissal of Pan Am M-130 voice Tx possibilities, here's a link that suggests they may have had that capability for local communication at leasthttp://fsim.net/b314clipper/team.htm(second paragraph)

The news item mentioning voice communications at distances less than 30 miles refers to the Federal Radio Commission (forerunner of the FCC) regulation applicable to communications between aircraft and airports in the continental U.S.

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